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Geology of Iowa : ウィキペディア英語版 | Geology of Iowa ''This article is about Iowa geology. For the study of buried human cultural remains in Iowa, see Iowa archaeology''. The geography of Iowa includes the study of bedrock, landforms, geology, and paleontology of the state of Iowa. ==Bedrock features== Iowa's bedrock geology generally increases in age from west to east. In northwest Iowa Cretaceous bedrock is ca. 74 million years old, in eastern Iowa Cambrian bedrock dates to ca. 500 million years ago.〔(Prior: ''Geology of Iowa: Iowa's Earth History Shaped by Ice, Wind, Rivers, and Ancient Seas'' )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Geology of Iowa」の詳細全文を読む
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